Variety is the spice of life, so to speak. You dont have to have the $65 HK steel mags to have a good reliable mag. I own and use both 20rd and 30rd Promags and they have yet to fail me in multiple HK93 clone rifles.
Dont hold your breath on Turkish mags. Dont waste your time. Just buy a half dozen promags and a few 40rd aluminum mags and be done with it (that goes for those of us with an HK93 or clone). If youre selling get a 30rd Promag and you will be fine.
FWIW, ive owned and fired AR15's since 1993 in both LEO and rec settings. Im bored with the AR. I did the AK thing for awile but I just could not get excited about them. A few years ago I bought an Hk91 on a whim and enjoyed it, but it didnt feel right shooting a collector. I sold it and went the '93 route and have really enjoyed the ride.